JEE Main Chemistry question

Proteins give:

(A)A violet colour with alkaline solution
(B)Form a purple colour on boiling with dilute ninhydrin solution
(C)Yellow colour on boiling with
(D)All of the aboveCorrect

Answer: (D)

Solution

Proteins give a positive biuret test (violet colour with alkaline copper sulphate, due to the peptide bonds), a positive ninhydrin test (purple colour, due to free amino groups), and a positive xanthoproteic

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Question ID VK-151207